US PATENT SUBCLASS 540 / 25
.~.~.~.~.~.~ The hetero ring is three-membered consisting of one oxygen and two carbons (e.g., oxirane, etc.)

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540 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6}
2  DF  .~.~ Cyclopentanohydrophenanthrene ring system containing {10}
6  DF  .~.~.~ Spiro {3}
15  DF  .~.~.~.~ The cyclopentanohydrophenanthrene ring system is part of a polycyclo ring system having at least five cyclos {1}
16  DF  .~.~.~.~.~ Hetero ring is one of the cyclos of the polycyclo ring system {5}
25.~.~.~.~.~.~ The hetero ring is three-membered consisting of one oxygen and two carbons (e.g., oxirane, etc.) {1}
26  DF  .~.~.~.~.~.~.~> The hetero ring shares the 5,6-positions of the cyclopentanohydrophenanthrene ring system

DEFINITION

Classification: 540/25

(under subclass 16) Compounds in which the hetero ring is three-membered consisting of one oxygen and two carbons.

(1) Note. An example of a compound provided for herein is: [figure]